National ACORN spokesman Kevin Whelan said Monday that the organization's board decided to close remaining state affiliates and field offices by April 1 because of falling revenues. Some other national operations will continue operating for at least several weeks before shutting for good.

Acorn Housing -- an offshoot of the political group Association of Community Organizations for Reform Now, or Acorn -- plans to remain in operation even though the main political group is disbanding, a spokeswoman for the housing group said.